function formatNumber (n) {
  const str = n.toString()
  return str[1] ? str : `0${str}`
}

function formatDate (date) {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()

  // const hour = date.getHours()
  // const minute = date.getMinutes()
  // const second = date.getSeconds()

  const t1 = [year, month, day].map(formatNumber).join('-')
  // const t2 = [hour, minute, second].map(formatNumber).join(':')

  return `${t1}`
}

export {
  formatNumber,
  formatDate
}
